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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb056b49acfffc4284cca3fff90a84d1c8ba274c0cba4db161f06b3065f007c4' 
  AND token = '9SFWcZgFMPKzIaqMi2qlLI24NFyfjy2q85dFyGkZvJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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