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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0160a804d5509734bf3320d5362682a99ee5730522ee4aa4c69cfebf12d43057' 
  AND token = 'FN832G3BsKfmU/aUt4ClBrt2XV0Kt2wrq4ZfjIO2WTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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