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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048434b2855cef4e2ef4387925d48d05ac9bf76186859a78fb35e83e873e58b2' 
  AND token = '1ysIB/8m9w09kAtYI9EgOEyJcSalBV1+FEdrB9gT5jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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