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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9226f1120c4fba0f23f04b60ce1482007b3cb232d98a49fc53e95387cdbe1903' 
  AND token = 'DbBAG2gLcD9xX487cqBmbkt4FKF3BPkt6/3ENG3WTiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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