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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e71ee7d4705037a8fac370f0383dc94c9005bfb8e4466266ff3d08613d3bad' 
  AND token = 'X5X16ifqmVRI6TqYBHbG91xdX3qSqrZDV+Wy9QLc/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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