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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d47894186095dc48633dc8ee40afe7811e85e5e36a2af05f663aadeb8d6bd6e' 
  AND token = 'ZHN9yG2a32yEmnuzysfJKDhtxXkJSGy/Gag1oODXhXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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