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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f270a7f4c5dc954ad363d35f886540e31b7e3933a4ca26773b825a82f2765d01' 
  AND token = 'hU0EyMAjZI+Hxx7kdF4T6U+Uixm+l0kp9IXBbdSCOTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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