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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba009ba4aa17f1f6bfd54542da85155bbc2fb226b4f10c1a010339ff2355b15b' 
  AND token = 'sDZDQGD47PaablzD9niPWndnogWhtxEdsGUXya7uCeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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