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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ca0499cdd4389ff0e01994fdd1a50cc3dc0f6324fb0e37d14c0ede1c7a985d' 
  AND token = 'TOR4WHExSswRDnh8gFDtvQvX3acjSVCu1PNsWZ2RmuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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