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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7ef4eb2af47299ae55c7e1c10d075a92f5c53648a2ea3d40aa88ce90e384a3' 
  AND token = 'p8XbhLcaTI6eQpESJgds967mSww4rOI8xbKD8wIADgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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