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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fe3ce1f664d8ccd0e2035b65b8d72954d0b8d04168ebd22bd6863b904acebc' 
  AND token = '8DsKV80MrTQSIwPBfgwPbFkYSwmWi+Udwgrsh7sbEcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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