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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273724ed08766608a5ebf744bfccefcef04f0d9fd9736c3354efa13fc252152f' 
  AND token = 'c4i2ii6vpV0OjJ3hpat9de/b+mej8wXOupvNP4wcVUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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