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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9415a4e8220df6a95d77e7659e75ba4417cfc0504007217dc63cb981184fef5b' 
  AND token = '7mq3q66lExvsQpz4wD7mL4tCiejVDH8AsRcVS3UTC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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