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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b49c3fc5dc1d2954eec34f4c4f1eb884acf439ccc09431f28a0e2f4683226f' 
  AND token = 'eTn3grgtkqr3BYsBTB5u6rMsL/v6b43e8tYmwkZIFvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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