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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5b653e72346f11080e62d0cf3306b9b9ee7f5cfc60777e8f4916c5f5861b99' 
  AND token = '7A/FkcuoX9mJW+KG6qBWsTcLOloiQDUeNOss2IpGRqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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