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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b483c424d34f337d057c2c9809504544b18575cc631106df8007eaf766484ef' 
  AND token = 'cVrfO0IeXeX0WTR3B5SNdtB7Hju6k1oOHoYzqPa/MYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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