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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406a44496351b8edcbf788b597e9a3621398dc53f7faaaef8ac333fe4abd64e8' 
  AND token = 'yVaXAPU01Ch4ibk8/WIKPunKZ/IA6qEEmEHrGx/WkhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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