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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce9ccffdebbdfb7b343ad880d09e5a4bc242b1babf861924f76c08c4717ef7' 
  AND token = 'Og4zk6MkvGj40t5QgaFtbVu++1vePosu7gMB2UBloYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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