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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd503255c34f9f68d023af92e0f90545da83d57dc1779c072d216b4a225cf8375' 
  AND token = 'DI5PLQUlHfI2Hpyl+QkFXuRI1E20vX+XdxiinEmzmpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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