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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d7f73c5474029e3ac74734951bc8fb7b00090ff099ec4f7997ca2894209a4a' 
  AND token = 'fkQuNKeKS6K5uo2uRH5oSXN8CSPhBbURvrNmuO+UeSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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