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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fcb5df956e7dcfa0b0a8d013b24db7a87c4dc93b685ec170ef46594ea6dcea' 
  AND token = 'uQ1gfN2+9oUvoquAEdMIfZ4mxzATEgUXpcoyJD+gvE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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