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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f27a63e573c5390253e5bc4d48a4aa6dc290710fe0925a7238581961c1f3daf' 
  AND token = 'CMb9uPCcuBYJMSCMUlkDBOKoO02U+PNLkcVxfN1mpds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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