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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409567d8ca1b91deaca3c275559a70f151e9d3718ff0f83541adfd98ec9dc3bf' 
  AND token = 'iakhb6rTxUuNpViUAcWIeCMi4RTeJQjhHRNziV+9Xig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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