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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072ea0a32d6648268a279e220ab5a026421c690a89ba93f9c284275731beef94' 
  AND token = 'slEefO7S5jnn2X/22pxrMHIx34KqRN4N/2NPPLUvspw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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