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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f116487bcaab48ff6a72514617f06a3770dcd1533078cb9654f34fb01a004796' 
  AND token = 'PnmhV4CHb5ec4/BRFDb8o8Whzm2B4DwLiftfVj9xe6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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