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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823c5bf311ef128409f6d9487bea31e16b2b5c1965d1bf185aaeee9733020286' 
  AND token = '+HLa6k6Z6eC7IXfF69GEg+i8KjESOqN5dcliD0wHUPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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