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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7faaf825fa2afb56945e03be76efaa80605ce5cd7dfd3d38acdfd860afeb070' 
  AND token = 'aQmeEO/snznVLTtzmz8Q+tZh2mMwyiyKH6seJik+qpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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