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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc8278e0b2e69bc9eeeb8591a6f3433a479f5309fad1c22df606f5481bf8635' 
  AND token = '0wcT+IVM8a8jefBPux7mFoKkIEkEiaBU2morXzIbyfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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