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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38e6b59a82ba35a6299183a6acc591dbe45feea1987b62c74ae75d83e6a1484' 
  AND token = 'eOg4tVmxhMu5yecrSsWWS8JYDHG1WPklagqSnFFE/sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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