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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325ce2e20683a9756ca47ae79559cf4da5e2b22040fad13c21edb3b5af39e9a6' 
  AND token = 'R5DkSWaZwYuYTOFWtKzA0kpXM7Avn9TJt4J5WaB9bzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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