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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8caa742b47185331d075e34fa1cc9e0401133a97cdf8001b3f8f8938a5d754c' 
  AND token = 'X3LFEP4xAuM/0zmwakcCBTpjSl7tr8j5QbPMEHFqmWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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