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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76756ed3492c57279be2bcb68b7f62cfd1a200be69f68ce849ae2c096ecce8b7' 
  AND token = 'vI+wH6ylUufA8L7GubnR1TI1FdX6/JU86v+xljIrEbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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