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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9698f694b565e703ca72397397778d37d51adf9a7a584eddafddf3d4d4d628' 
  AND token = 'aMHXKCj1UlplUp8IX+xX4q8JYW52Ak7NPERrWEpuISk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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