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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bd00a37f1628952612edb6cdb374c3bffc6d9dc0da0456452036ddb4d432ae' 
  AND token = 'rzizWjVW5EVwI/Ni6iYgwUzD2lmPYitbPOFBbVEeogk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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