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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed1d1ed7984c394abb0b20c89fdb914db2c581a6a968d21419367c7f65b4933' 
  AND token = 'qTcuUFv8bp1ugaDwjmow0pn9MIm2I1NRix/uSVzbDiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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