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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0790ae9d74781473c74bb0f490220f06568c0a32b8c1d17426054af03e53a2' 
  AND token = 'cliUfcgX96uHzrnMIu2jcFI8UxILCRaCtJ9E9rqar8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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