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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fb717b2b551292cf12723220df8a86e4fd21590d3bd3ca58de7f5e63d4b40a' 
  AND token = 'unmtBKp/Ia3MFoUyDpHujHenieCsWLE1Kg7uVJwRrC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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