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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d9900146cf24c948871d025dd88b4b5e0cfeb877cd5ce1789c84ffe398e396' 
  AND token = '+MF09N7d2ipzIgbbkVwyMmfmfm+GVGzHw5CgEOQqCws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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