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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb37bce74afa6e0d18214b1ce205d03c58490034a2b439afb0f1012472d54449' 
  AND token = '1sB8dXauz7EHyleW6C+6Nj5or1iJ163vHnxfsX/PDUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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