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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329b930e7e847fc97c0982e31437708f705f269f2b4d165b9baf83efdd2ed64d' 
  AND token = '/qIdvKrSbLrvcOJfd1X3FrZlrNubiZ+MIFHfQi6pAWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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