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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940643d8e7ed9e40a9b7d755be10e33704670b9831202d6953f68924a2441207' 
  AND token = 'aeMiVwFefrCpWaT5beOIfsgJcIhC0nGImh0NDJV5dgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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