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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30cb9bcab867eb81201df6efa92b6ac3c4ecc37b02d9220ed05caa75d039e12' 
  AND token = '0JzWUVCa6htTHK14RsUqUVfHbiycEf88ndD7pxYw1TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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