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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347787241b51eb842a65e2b2af1170fd8de7a24582cd9e4f5011cc3e8fd442f7' 
  AND token = 'dzx5cvnejj2HGj1Z/cpoqozETu4jewusVXTxPkxBJ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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