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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9bfee0d24c7892d3682b46296c99805482f7b18ef413b4baeb954cba44aba9' 
  AND token = 'iIBk1YHwMN4mU//PwzbyNUMSRsl/HXxv57WNwGyZDCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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