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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896eb3eaca66609c2c569a5afd187234c07bdb909a12d6966215b3631423fb4c' 
  AND token = 'CfgfYxRt+WYZLSdjvMmPzrNIvv3baFlArGRl8Ix4A30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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