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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d97516b6c8561176a202eba32d9e494044d07c456ecb96beb1eafd1da96f37' 
  AND token = 'qfAmP6/GGK7ji1GbcQPc3m5AHFT6dQ+iLevDeV53wA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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