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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad1b03a846336b767c591b029eebb69641d9b59393c10f051c3b26397e50896' 
  AND token = '/isVmWBSjSBKrF9AZMZrmq5mO7JbveAYEoXaXL6YB3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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