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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2da751e7b2f16cae0560931fceeb56626369794124ead3dc19f40bb04a58cfe' 
  AND token = 'vRNRfpia9eFlAh1IacpbBX9BUka6RRIqORSSz4gVLWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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