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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da653d9032eda8b3bf6ac0146978c5b208f72facb10174274eb4fa0fd5d80488' 
  AND token = 'SsZttTpTaBQqArD79VwCk1moQcdP8e0kCdCf+zapZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}