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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96159e65aa5306859849c6370d24cc2356db607ba81438773cd667e936fb7a2d' 
  AND token = 'uFIilTI7YwfhB4Vroo9YSa4L/ER6+bRmrH54QzAF3IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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