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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c69d5d9e6e627875b6957e9f0dfd2ec4a045a24dc6272097b7a4bfa214ed7e6' 
  AND token = 'A7tdcuiwf3hoNoQ9VFCEtVj1yUSF2bO8xxUFQJkVFCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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