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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd585eafebd55bce69d687aacd6ad909d25ebad012fa2599ec6c3952d2c66f9e' 
  AND token = 'u+QqWFnYc5V736jQxEuDBwWvjCbWw42hULJi9pCGqRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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